The next generation of AMD cards based on the Navi architecture could be unveiled at Computex this year. However, according to some other rumors, they could also have their own dedicated release event on July 7 this year. It would be a good choice of date, as the potential success of Navi hangs on its state-of-the-art 7nm nature.
https://www.notebookcheck.net/AMD-Navi-could-see-launch-on-July-7-2019-latest-rumor.417471.0.html